ENTEROPNEUSTA FROM THE ABROLHOS ISLANDS. 99 



7) 7? ' I 



J) ~R " I ■ ■ • ■ -'^^^^^^ roots of nerve-cord. Fig. 2. 



D.Sept Dorsal septum of collar. Fig. 10. 



D.v Dorsal vessel of collar. Figs. 5 & 8. 



Eff.v Efferent vessels of proboscis. Figs. 5 & 8. 



Ep.al Epithelium of alimentary canal. Figs. 10 & 12. 



JEp.p.n Epithelium of neck of proboscis. Figs. 8 & 9. 



Epi Epithelium external to nerve-fibre layer. Figs. 5, 10, & 12. 



Epid. Epidermis of proboscis. Fig. 2. 



G Gonads, Fig. 11. 



G.pl Genital pleura. Fig. 11. 



Gl.c Gland-cells. Fig. 6. 



glom Glomerulus. Fig. 2. 



G.p Branchiopore. 



i.l.m Inner longitudinal muscles of collar. Figs. 8 & 9. 



l.m.c Longitudinal muscles of collar. Figs. 2 & 10. 



Ljnus Longitudinal muscles of branchio-genital region. Fio-. 11. 



l.p.St Lateral pouch of stomochord. Fig. 2. 



Lat.Sep Lateral septum. 



Mus.R Radial muscle collar. Fig. 10. 



N.l Nerve-fibre layer of epidermis. Figs, o, 10, & 12. 



N.r.p Nerve-ring of proboscis neck. Figs. 8 & 9. 



Oe Esophageal division of alimentary canal. Fig. 11. 



P.p Proboscis pore. Figs. 8 & 9. 



Par.R Parabranchial ridges. Fig. 11. 



Per Pericardium. Figs. 2, 4, 5, 9, & 12. 



Per.Sp Perihaemal space. Fig. 2. ' 



Perip.Sp Peripharyngeal space. Fig. 2. 



Post.Np Posterior neuropore. Fig. 2. 



Pr.Co Proboscis ccelom. Figs. 2 & 5. 



Pi/ff Pygochord. Fig. 12. 



rad.glom. . . Radial portions of glomerulus. Fig. 4. 



Rad.M Longitudinal muscles of proboscis in radial bundles. Fio-. 3, 



Sept. V. .... Septal vessel of gills. Fig. 11. 



Sk Nuchal skeleton. Figs. 2, 6, 7, & 8. 



Sk.' Lateral wing of nuchal skeleton. Fig. 8. 



'S'^." Projections of skeleton clasping ventral proboscis ctecum. Fig. 8. 



Sk.'" Cornua of nuchal skeleton. Fig, 10. 



Sk.l Lateral projection of anterior part of skeleton. Fio-. 6. 



Spl Splanchnotheca, Figs. 2, 4, & 5. 



St Stomochord. Figs. 2, 4, 5, 6, & 7. 



St.c Cavity of stomochord. Figs. 5 & 8. 



St.O Opening of stomochord to pharynx. Fig. 2. 



St.p Lateral pouches of stomochord. Fio-. 6. 



V.mes Ventral mesentery. Fig. 11. 



V.n Ventral nerve-thickening. Fig. 11. 



V.p.c Ventral proboscis ccelom. — Cavity of "racemose organ." Fio-s. 2 6, & 8. 



V.plex Ventral vascular plexus of collar. Fi^s. 2 & 10. 



V.p.p Proboscis pore vesicle. Figs. 8 & 9. 



V.p.s Ventral proboscis septum. Figs. 4, 5, 6, & 8. 



W.per Wall of pericardium. Figs. 4 & 5. 



